Ch 3 Neurons and Glial Cells Flashcards
How do neurons transmit signals?
action potentials which travel along nerve fibers.
Do neurons in the CNS regenerate?
No they do not
True or false if the cell body of a neuron is damaged the neuron will die?
True
Where do nerve cells receive input from other neurons?
Spines
What happens to the number and density of spines as newborns age?
The spines and density increases as a child ages.
Can charged ions diffuse across the cell membrane?
No they need to pass through ion channels to get into the cell.
True or false ions will flow from an area of high concentration to low concentration?
True
Is it possible to move an ion against the concentration gradient?
Yes, membrane pumps allow for this utilizing ATP . For example, the NA and K pump is always on.
Modality- gated channels open for what kind of stimulus?
A physical stimulus
Ligand- gated channels opens for what kind of stimulus?
A binding of a chemical to the channel protein.
Voltage- gated channels open to what kind of stimulus?
Changes in electrical charges found on either side of the cell.
At resting membrane potential what is the charge inside the cell membrane?
negative charge
What is described as the interval of time between action potentials?
the refractory period
True or false topical anesthetic drugs block Na channels so that the ions cannot enter the neuron to create an action potential?
True
What is the most common demyelinating disease
multiple sclerosis
